Modular/Manufactured Home - Spec Building??

[Mike Herbon]

Initial planning phase.....Another investor and I are looking at purchasing four adjacent lots and considering speculative home building on these sites.  Considering manufactured/modular homes.  The idea is that we'd complete the site development and basements, and would then have modular homes arrive (time savings, but $$$?).  I realize that the traditional stick build may end up being a similar cost, but am looking for some input from anybody that may have experience with this type of spec building.

Thanks in advance.